About the partition when install redhat 6.0.

I have a 20G harddisk. Now Only have a primary partition in the
first 2G, which is used in WINDOWS 98 FAT32.

I want to use the next 3G space to Linux and use the rest to the
Extend DOS partition for WINDOWS98 FAT32. I don't want to
install the linux in the same Extend Partition with DOS. How can I
do?

I read the redhat install guide books, and it is said that the LINUX
need 3 partition, one for swap, one for boot, and the other for root.
But the max partition for the one physicial harddisk is 4, how can
I do?

not true, since the logical extended partition can hold any number of partitions. And you do not need three partitions, you CAN work with a single, but two is useful ( / and swap)
But you need UNPARTITIONED

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